Guard for planing machines and the like



Ma 31 1927. v

y A. J. RETZ GUARD FOR PLANING MACHINES AND THE LIKE 2 Sheets-Sheet, 1

Filed May 5. 1924 1 I l l I INVENTOR flu; vmfie A'r'fYs May 31, 1927,, 1,630,671

. A. J. RETZ GUARD FOR PLANING MACHINES AND THE LIKE Filed May 5. 1924' 2 Sheets-Sheet 2 i I g k ENVENTOR r w x 41W y 1; W 4

- N w W YMMV 7 Patented May 31, 1927.

nnrrro STATES PATENT OFFICE.

ANDREW/V J. RETZ, OF NEW YORK, N. Y., ASSIGNOR, BY I/[ESNE ASSIGNMENTS, TO B. HOE AND 00., INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

GUARD FOR .PLANING MACHINES AND THE LIKE.

Application filed ma 3,

This invention relates to certain improvements in guaros for rotary cutting or plan ing machines.

It is the particular object of the present invention to produce a guard for this class of machines which shall be so arranged as to extend or he over the cutting tool during the cutting operation, the guard being mounted so as to be adjustable to and from the cutting tool to take care of variations 1n the thickness of the work. A further object of the invention is to provide such a guard which may lie over the cutt ng tool during the cutting operation and which may have a longitudinal movement with respect to the tool, this longitudinal movement being given the guard by the work when the work, such as a plate or plank, s passed through the machine edgewise, the guard returning to its initial position after the work has passed it. A further object of the prescnt invention is to produce a guard of simple construction, the movement of which is easy to regulate and which may be embodied 1n cutting or planing machines already bullt, as well as in new machines.

With these and other objects not specifically referred to the invention consists in certain novel parts, arrangements and combinations which will be described in connection with the accompanying drawings, and the novel features pointed out in the claims hereunto annexed.

In these drawings Figure 1 is a plan View, partly in sect on and partly broken away, of so much of a cutting or planing machine with the guard in position as is necessary for an understanding of the invention;

Figure 2 is a vertical sectional view taken on the irregular line 22 of Figure 1;

Figure 3 is a cross sectional view taken on line 3-3 of Figure 1;

Figure a is an end view, partly in section, the View being taken looking in the direction of arrow 4 of Figure l, and

Figure 5 is a detail plan view of the frame in which the guard operates.

Referring now to these drawings, the guard has been illustrated as embodied in the cutting or planing machine in whlch the cutting tool is longitudinally arranged. The particular form of cutting tool may, of course, be varied, but, as illustrated, comprises a 1924. .Serial no. 710,863.

knife carrier 1, mounted on a shaft 2 suitably supported in the machine, the cutting.

elements being in the form of knife bars 3, a plurality of these bars being secured on the carrier. This cutting tool works through a slot 4, in a work support which is shown as a flat table 5. I i

The improved guard is mounted so as to lie above the cutting tool and extend substantially the length of the tool, and prefer ably, furthermore, this guard will extend be yond the tool on each side and over the work support, as clearly shown in Figure 1. While the particular construction of this guard may be somewhat varied, it will be arranged so that it is adjustable to and over the tool, and so that it may have a sliding movement longitudinally of the tool, this movement being given the guard by the work where the work is being operated onflinan edgewise position, or where a very narrow piece of work is being cut or planed. As shown, the guard comprises a shield of light metal, or other suitable material, marked 6, this shield being, as shown, formed and dimensioned to extend substantially the length of the exposed cutting surface of the 'tool and beyond the tool at each side so that a workmans hands are protected whether the work is being operated on flatwise, as shown in Figure 2, or edgewise', as shown in Figure 1.

l/Vhile the guard may be mounted in various Ways, in the particular construction shownthere is provided a carrier frame, comprising side bars 7-8, united by cross bars or braces 9, these in turn being joined by a web 10. Above the guard the side rails of the carrier are joined by arch shaped frame pieces 11, thus producing a rigid structure, these frame pieces, furthermore, forming a convenient means for lifting the carrier when it is desired to adjust the guard relatively to the cutting tool, and the frames 11 are in turn joined by flanges or webs 12, which are secured to the carrier rails 7-8 in any suitable manner, as by screws 13. The side rails 78 of the carrier frame are channeled, as indicated at- 14 in Figure 3, for the reception of balls 15, or other suitable antifriction devices, so as to permit an easy longitudinal movement of the guard in the carrier frame. Additional side guides 16 are or may be provided for strengthening the construction and guiding the guard, these additional guides 16 extending outward over the work support, as shown in Figure 1.

The longitudinal movement of the guard with respect to the cutting tool is particularly useful when a piece of work is being operated on edgew'ise, or when a narrow piece of work is beingcut or planed, and this movement is effected by the work itself, as illustated in Figure 11' hen a narrow piece of work is being passed through the machine, the front end of the work, indicated by W', engages the guard, and the end of the guard is so shaped that the forward movement. of the work causes the guard to move backwardly to permitthe work to pass :it. To effect this therefore the nose of the guard is formed on afliagonal, as indicated at 17 in Figure 1. The front end of the work pushingon thisdiagonal forces or wedges the guard backward and permits the work to pass the guard. As the guard extends over thework support the hand of the op-I erator is protected by the guard and bythe work itself. In the best constructions means are provided for automatically returning the guard to its initial position, the guard being moved against such means by the work. VVhilevarious constructions for effecting this may be employed, in the particular construction illustrated the guard is moved against a weight which, after the work has passed the guard, attends tomovin 'z; the guard back toits initial position. As shown, the guard, see particularly Figure 2, is provided on its underside with a boss 18, to which is secured one end of a chain 19, this chain at its lower end carrying a weight 20. The chain passes over a chain sheave 21, mounted on a stud 22, carried from a bracket 23 suitably supported on the carrier frame.

The carrier frame is mounted so as to have a. vertical movement. In the pa'rtioular construction illustrated the rear cross bar 9 of the frameis formed with a hub 23, whichhas dependlng therefrom an GKtGIiSlOIl 24;,which lies in a socket 25, depending fromthe under side of a bracket 26 secured to the work support 5, before referred to. This extension 241i?) keyed or splined by a key 27 so as to prevent it from rotating in the socket, and

is held in adjusted positionby a set wheel 28.

these arms having hubs 3i, supporting, a,

shaft 32, this shaft having a! vertical movement 111 slots 35:3, n a pair of standards 34,

rising from a plate 35, supported on an extension 36 of the work support 5, before referred to. j

The edge bar is thus vertically ad ustable to and from the work support, and is ad. jlIS-Il'il'bl horizontally of the work support through the plate 35, which is provided with slottcc'lv extensious 3?, in which work set screws 38, these set screws passing through the slot and seating in the work support.

TVhile the invention has been shown and described in what believed to be its best form, it will be understood that various changes in structure and arrangement of the parts may be made, as well as in the shape of the guard, and that the invention is not to be limited to the precise structlu'o shown and described. i i

What Iclaim is: y The combination of a work suliaport having a slot, acutting tool working tl'uough the slot, a guard normally extended over i a slot, means for (allies-tine a reciprm'rating movement of the guard, a frame including side plate crossed webs and curvml connecting webs in which the guard is a-iupported, said frame having sliding connection witll.

the support, a hub 'arried by the frame, a'

socket depending from the work support, a leg depending from the hub and splined in the sockcnwhereby the leg held against rotationbut mayhave a vertical movemei'it in thesocket, and means for locking thelc r in adjusted position in the socket.

In testin'lony whereof, I have heri-aunto set my hand." 1

ame-w .i. mrrz. 

